blob: d3fcbda907a7317e3b24589e9a281fc0f648994c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
# This module checks if the C++ compiler supports the restrict keyword or
# some variant of it. The following variants are checked for in that order:
# 1. restrict (The standard C99 keyword, not yet in C++ standard)
# 2. __restrict (G++ has it)
# 3. __restrict__ (G++ has it too)
# 4. _Restrict (seems to be used by Sun's compiler)
# These four cases seem to cover all existing variants; however some C++
# compilers don't support any variant, in which case the _RESULT variable is
# set to empty value.
#
# Copyright Benoit Jacob 2007 <jacob@math.jussieu.fr>
#
# Redistribution and use is allowed according to the terms of the BSD license.
# For details see the accompanying COPYING-CMAKE-SCRIPTS file in
# kdelibs/cmake/modules.
INCLUDE(CheckCXXSourceCompiles)
MACRO (CHECK_RESTRICT_KEYWORD _RESULT)
SET(_CHECK_restrict_KEYWORD_SRC "
char f( const char * restrict x )
{
return *x;
}
int main(int argc, char *argv[]) { return 0; }
")
SET(_CHECK___restrict_KEYWORD_SRC "
char f( const char * __restrict x )
{
return *x;
}
int main(int argc, char *argv[]) { return 0; }
")
SET(_CHECK___restrict___KEYWORD_SRC "
char f( const char * __restrict__ x )
{
return *x;
}
int main(int argc, char *argv[]) { return 0; }
")
SET(_CHECK__Restrict_KEYWORD_SRC "
char f( const char * _Restrict x )
{
return *x;
}
int main(int argc, char *argv[]) { return 0; }
")
CHECK_CXX_SOURCE_COMPILES("${_CHECK_restrict_KEYWORD_SRC}"
HAVE_KEYWORD_restrict)
IF(HAVE_KEYWORD_restrict)
SET(${_RESULT} restrict)
ELSE(HAVE_KEYWORD_restrict)
CHECK_CXX_SOURCE_COMPILES("${_CHECK___restrict_KEYWORD_SRC}"
HAVE_KEYWORD___restrict)
IF(HAVE_KEYWORD___restrict)
SET(${_RESULT} __restrict)
ELSE(HAVE_KEYWORD___restrict)
CHECK_CXX_SOURCE_COMPILES("${_CHECK___restrict___KEYWORD_SRC}"
HAVE_KEYWORD___restrict__)
IF(HAVE_KEYWORD___restrict__)
SET(${_RESULT} __restrict__)
ELSE(HAVE_KEYWORD___restrict__)
CHECK_CXX_SOURCE_COMPILES("${_CHECK__Restrict_KEYWORD_SRC}"
HAVE_KEYWORD__Restrict)
IF(HAVE_KEYWORD__Restrict)
SET(${_RESULT} _Restrict)
ELSE(HAVE_KEYWORD__Restrict)
SET(${_RESULT} ) # no variant of restrict keyword supported
ENDIF(HAVE_KEYWORD__Restrict)
ENDIF(HAVE_KEYWORD___restrict__)
ENDIF(HAVE_KEYWORD___restrict)
ENDIF(HAVE_KEYWORD_restrict)
ENDMACRO (CHECK_RESTRICT_KEYWORD)
|
